sdcc-3.9.0 fork implementing GNU assembler syntax

This fork aims to provide better support for stm8-binutils

1 files changed, 110 insertions, 0 deletions

diff --git a/device/lib/_fsrshift.c b/device/lib/_fsrshift.c
new file mode 100644
index 0000000..1399ad2
--- /dev/null
+++ b/device/lib/_fsrshift.c
@@ -0,0 +1,110 @@
+/*-------------------------------------------------------------------------
+   _fsrshift.c - Floating point library in optimized assembly for 8051
+
+   Copyright (c) 2004, Paul Stoffregen, paul@pjrc.com
+
+   This library is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the
+   Free Software Foundation; either version 2, or (at your option) any
+   later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License 
+   along with this library; see the file COPYING. If not, write to the
+   Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA.
+
+   As a special exception, if you link this library with other files,
+   some of which are compiled with SDCC, to produce an executable,
+   this library does not by itself cause the resulting executable to
+   be covered by the GNU General Public License. This exception does
+   not however invalidate any other reasons why the executable file
+   might be covered by the GNU General Public License.
+-------------------------------------------------------------------------*/
+
+
+
+#define __SDCC_FLOAT_LIB
+#include <float.h>
+
+
+#ifdef FLOAT_ASM_MCS51
+
+static void dummy(void) __naked
+{
+	__asm
+	.globl	fs_rshift_a
+fs_rshift_a:
+	jz	00020$
+	mov	r0, a
+	add	a, exp_a	// adjust exponent
+	jnc	00001$
+	mov	a, #255		// don't roll over
+00001$:
+	mov	exp_a, a
+#ifdef FLOAT_SHIFT_SPEEDUP
+	mov	a, r0
+	add	a, #248
+	jnc	00003$
+	xch	a, r4
+	xch	a, r3
+	xch	a, r2
+	mov	r1, a
+	clr	a
+	xch	a, r4
+	//mov	r1, ar2		// avoid dependence on register bank
+	//mov	r2, ar3
+	//mov	r3, ar4
+	//mov	r4, #0
+	add	a, #248
+	jnc	00003$
+	xch	a, r3
+	xch	a, r2
+	mov	r1, a
+	clr	a
+	xch	a, r3
+	//mov	r1, ar2
+	//mov	r2, ar3
+	//mov	r3, #0
+	add	a, #248
+	jnc	00003$
+	xch	a, r2
+	mov	r1, a
+	clr	a
+	xch	a, r2
+	//mov	r1, ar2
+	//mov	r2, #0
+	add	a, #248
+	jnc	00003$
+	mov	r1, #0
+	ret
+00003$:
+	add	a, #8
+	jz	00020$
+	mov	r0, a
+#endif
+00005$:
+	clr	c
+	mov	a, r4
+	rrc	a
+	mov	r4, a
+	mov	a, r3
+	rrc	a
+	mov	r3, a
+	mov	a, r2
+	rrc	a
+	mov	r2, a
+	mov	a, r1
+	rrc	a
+	mov	r1, a
+	djnz	r0, 00005$
+00020$:
+	ret
+	__endasm;
+}
+
+#endif